Uniaxial Nonlinear Viscoelastic Constitutive Model for Asphalt Concrete

This paper proposes a nonlinear, uniaxial viscoelastic constitutive model for asphalt concrete. Based on the observation that asphaltic materials exhibit linear viscoelasticity at small strains/stresses and nonlinear behavior at larger strains/stresses, many existing models separately employ linear viscoelastic models for the former regime and plasticity or damage models for the latter. A model is proposed in this paper that deviates from this trend. It assumes that asphalt can be simultaneously characterized by both linear and nonlinear viscoelastic models, each of which dominates during the pertinent mechanical regime. By combining a nonlinear damper with a generalized Maxwell model, the behavior of asphaltic materials in both linear and nonlinear ranges can be simulated with a single set of material parameters to cover a wide range of time, temperature, and stress/strain levels. Numerical integration algorithms for strain controlled loading and a calibration method employing constant strain rate test data are proposed. The model also employs the time temperature superposition principle and damage mechanics to account for temperature dependency and damage evolution, respectively. Application of the model to asphalt concrete is demonstrated using experimental data from disparate researchers. The proposed constitutive model is demonstrated to be capable of successfully simulating constant strain rate tests at differing temperatures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Authors:
  • Park, Philip
  • Wineman, Alan
  • El-Tawil, Sherif
• Conference:
  • Asphalt Paving Technology 2011
  • Location: Tampa FL
  • Date: 2011-3-27 to 2011-3-30
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Print
• Features: CD-ROM; Figures; References; Tables;
• Pagination: pp 317-346
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 80
  • Publisher: Association of Asphalt Paving Technologists (AAPT)
  • ISSN: 0270-2932
  • Serial URL: https://www.asphalttechnology.org/site_page.cfm?pk_association_webpage_menu=9169&pk_association_webpage=19109

Subject/Index Terms

• TRT Terms: Asphalt concrete; Nonlinear equations; Numerical analysis; Viscoelasticity
• Uncontrolled Terms: Constitutive models
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01367557
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 10 2012 3:17PM